Step 1: Gather the Parts
•a cheap portfolio [I bought mine for €1.50] with the metal holder
•some doublesided tape [optional, but you'll get a very strong grip at the end]
•and (obviously) your flip cover [I'm using S4 SView cover]
Step 2: Let's Move!
Just remove the metal holder from the portfolio.
Step 3: Insertion
Step 4: Grip It
PRO-TIP: If the gap of your holder is too narrow, you can open it a little just for inserting the tape.
Step 5: Let's Finish It!
Yes, this is a little cheap project and it's so simple that a baby can do.
[This is my first instructable... I hope you enjoyed it and please leave me some tips and suggestion in the comments :3]